Electrical induction apparatus



July 20, 1948. P. NARBUTOVSKIH 2,445,450

ELECTRICAL INDUCTION APPARATUS Filed June 11, 1943 2 Sheets-Sheet 1ATTORNEY P. NARBUTOVSKIH ELECTRICAL INDUCTION APPARATUS July 20, 1948.

Filed June 11, 1943 2 Sheets-Sheet 2 WHTNESSES:

BY 526% ATTORNEY Patented July 20, 1948 UN Ski OFFICEELECTRICALJNDUCTION APPARATUS Paul;.- Narbutovskih,.-. Sharon, Pa...assignorto Westinghouse Electric Corporation, East Pittsburgh; Pai, acorporation of Pennsylvania ApplicationJune 113 1943, Serial .N 0-.490,445

8 Claims.- .(Cl. 323+55)" My invention 1-relates---.to. electricalregulating systems havinga 1stepaby step operating. characteristic;.-andmore particularly to improvements. in,-thecontrol of such automaticelectrical -.regu-.,

lating: systems.

In many.automaticelectricalregulator systems employingstep-typeeequipment; such. as undera.d"';t3,p5 changersmfontransformers, it is :desirabl-et-hatthe tap changing: mechanism oncesetin operation continue itsoperatiomuntil th8 C0m-' pletion of aparticular tap change, thus effecting one; steprof operation of. the-tapchanging .-mech--. anism and a .correspondingsteppi changein :the Youtput or secondary ,yoltage;---

It is.;also=desirable thatthe mechanism shall.

age;;such as by: switching operations :or otherwise.

In .-:order*to prevent unnecessary operation ofithe. mechanism as aresult of slight and temporary changes :in :the' voltage; it,- hasbecome, customary to. provide a time delay-relay iordelay-ing theoperation .:;of;. the tap changing mechanism for.- a short-time intervalafter the operation. of theprimary; relaycso ,thatif .thesecondaryyoltagerre adjusts itself within the time. delay; intervalatheoperationof the regulating. mechanism will not.

be: required -:and--.will not take: place.-

not; operate frequjen-tly between adj aoent tap positionsi-npon slightchanges in voltage; such as ithose' of short; duration-:which may-becaused bywtemporary.--fluetuationsin the secondary volt.

Inhthe. usual-a type: of regulating systems,.-a me:

chani'eal-time-delay;.relay having a dashpot on similar: itime-delayingamechanism has beeniused in r the: control circuit between :the primaryrelay,

initiating.;tha operation-of the: regulator,-..and thesecondary1-;relay,-, completing :the' circuits con-1 trollingthej: regulator.moton, In accordance with; myzinventioma thermal relay. is employedwhich is-v-very light: in weight and 'requires little-energy a tooperate. The, time interval is dependent upon. the:;time necessaryforheatinga.bimetalelement to a predetermined temperatureafter-therelay- Y iszenergi-zed and the =timerinterval I required: fordissipation of this storedwheatzand .the cooling.

oither-bimetal element-to a lower predetermined temperature afterthe-heating. element of the=\re-.

layisydeenergizedr It is an object: of. :the: invention .1 to .provide aregulator. zequipmentethat visa iautomatically cone trolled inaccordancemwith-zamelectricah characteristic; of a circuit to heregulatedin, which: a

timewinterval is. introduced between the closing of theprima-ryrelaycontacts and the operation .of

the; regulating. mechanism:

A further object. of. the. invention isthe provision of .a regulator'system oithe character. in.-,-

dicated in which the means for-introducing the- 1 timezintervalinto theoperation :of the system is a thermal relayrequiring. a small amount of'energyw .only-to. operate it and having a cycle of operationiniwhichthe temperature responsive element is first heated-toapredeterminedvalueand them;

cooled :to a lower .predeterminedvalue;

Other objects and-advantages-of the-invention ,will .beapparent from thefollowing description.

of a preferred embodiment: of the. invention, reference being had to theaccompanying drawing, in which Figure -1 isa diagrammatic view ofcircuits and apparatus-:illustrating.-a. regulator system: ar-.

ranged in accordance with .the invention;

Fig; 2 is-a front'elevational view of the timing.

relay;

Fig. 3 he side view oi-the timing relay,-partsbeing shown in .sectionand Figs.4 and 5 are-detailsof. the switch elements of the timing:'relays.

Referring particularly to Fig. .1, conductors l,

2 and -3.represent-the conductorsof a three-phase. alternating-currentpower. circuit connected to 1 primary transformer windings 4, 5 .and 6that are inductively related to secondary windings .1,

8 and 9 through which energy is.supplied to the changing switch :contactmembers M connected totapped-ipoi-nts on the: secondary windings], 8

and-:9 andicooperating iwithmovable switch con-1 tactmembers I 5 ineachoflthe three phases-that.

are similarly operated by a mechanism illustrated asan armrllicontrolled by-a screw-threaded shaft l1. that. isaoperatedl through..suitable gearing mechanism 18 by a motor. |9.. Control equipmentforthe:.motoroperated tap changingequipment is provided: comprising .-acircuit controlling .ele-- ment orprimary relay. 20 for operatingthemotor.

lit-in one direction through control ofla timing. relay 2l,'an auxiliaryrelay 122 and .a secondary.

relay 23, or for operating themotor-JIB in the op--posite.direction-through control of .a timing relay 24', an auxiliaryrelay -25.and a secondary relay 26.

The. primary relay 2Dis providedwith a pivoted...

movablearm 3land an electromagnet havingan I armature. energized. by anoperating winding...

32 connectedrby -conductors 33 .and .34Hto the secondarycircuit-conductors i 2' and I 3 for opera ating the relay 2D inaccordance with the voltage of the secondary circuit conductors. Thelever 3| is also biased by a spring 35, the combined influence of thewinding 32 and spring 35 being effective to operate the arm 3| to movethe relay contact member 36 into engagement with the one or the other ofthe contact members 31 or 38 as the voltage of the secondary circuitdrops below or increases above the desired voltage.

If, for example, the voltage of the secondary circuit drops below thedesired value, thus causing the contact 36 to engage the contact 31, acircuit is closed from the supply conductor 28 through conductor 39, arm3|, contact members 36 and 31, conductor 4|, contact 42 in itsillustrated position, the winding 43 comprising the heating element ofthe timing relay 2|, conductor 44 to the supply conductor 45. In theinitial or illustrated position of the timing relay switch, the movablecontact member 46 is in engagement with contact member 41 closing onepoint in a circuit which is held open by the contact member 48 of theauxiliary relay 22 in its illustrated or deenergized position. Upon theheating of the bimetal element 49 to a predetermined temperature, thiselement causes the movable element 46 of the switch to move with a snapaction from the contact member 41 into engagement with the contactmember to close a circuit through the primary relay contact members 36and 31 and conductor 52, winding 53, and conductor 44 to the supplyconductor 45 thus energizing the auxiliary relay 22, causing its severalcontact members to move upwardly, as illustrated in the drawings, thusinterrupting the circuit formerly closed through the contact member 42and closing contact members 48, 50, and 54. The contact 54 in moving toa circuit closing position closes a holding circuit in shunt to thecircuit through switch contact members 46 and 5| of the timing relay,which holding circuit is completed through the contact members 36 and 31of the primary relay. The upward movement of the relay contact member 42interrupts the circuit through the winding 43 of the timing relayconstituting the heating element of that relay, thus permitting thebimetal element 49 to cool. The contact member 48 closes one point in acircuit for energizing the secondary relay 23 which circuit is, however,interrupted so long as the switch contact member 46 remains inengagement with the contact 5|.

The contact member 50 closes a holding circuit in shunt relation to theholding circuit through the contact member 54. This circuit extends fromthe supply conductor 28, through the conductors 39 and 40, contact 36 onthe relay 23, contact 50 on the relay 22, conductor 52, winding 53, andconductor 44 to the supply conductor 45. The purpose of the holdingcircuit through the contact members 30 and 56 is to discontinue thecontrol of the relay 22 by the primary relay for the interval of timeafter the relay 22 has been energized during which the bimetal 49 iscooling. If this is not done, and if, during the cooling period of thebimetal, the contacts of the primary relay keep opening and closing,this will cause repeated operation of the relay 22, causing excessivewear.

When the bimetal element 43 of the timing relay 2| has cooled to apredetermined value, the contact member 46 moves by a snap action fromengagement with the contact member 5| into engagement with the contactmember 41, thus completing a circuit from the supply conductor 28through the primary relay contact members 36 and 31, conductor 4|,timing relay contact members 46 and 41, auxiliary relay contact 48,conductor 55, secondary relay winding 56, conductor 51 to the supplyconductor 45.

If the contacts 36 and 31 are separated when the above traced circuit isclosed, then the operation of the relay 23 is only momentary and lastsonly long enough to deenergize the coil 53 and permit the auxiliaryrelay 22 to drop to its deenergized position and thus to interrupt thecircuit through the winding 56 of the relay 23, so that this relay 23drops to its deenergized position before it has been closed long enoughto cause any movement of the motor I9. If, when the above traced circuitenergizing the winding 56 is closed, the contacts 36 and 31 are inengagement, then the winding 53 of the relay 22 remains energizedthrough the circuit including the contacts 36 and 31 and the contactmember 54.

The secondary relay 23 is thus energized and operated to its upper orcircuit closing position, bringing contact members 58 and 59 to theircircuit closing positions. The contact member 59 completes a circuitfrom supply conductor through conductor 51, contact member 59, conductor62, to one terminal 63 of the motor l9, and from the terminal 64 to thesupply conductor 28 causing the motor to operate in a direction to raisethe voltage of the secondary circuit. Upon starting of the motor IS, acam 65 is operated, closing a switch contact member 66 which completes aholding circuit from supply conductor 28 through conductor 61, switch66, conducfor 68, secondary relay contact member 58, conductor 1|, relaywinding 56, and conductor 51 to supply conductor 45, thus holding therelay 23 in its circuit closing position until the motor has operatedthrough a sufficient number of revolutions to bring the tap changingmechanism to its next tap changing position, thus interrupting theholding circuit through the cam operated contact member 66.

If, prior to the opening of the switch 66, the primary relay contacts 36and 31 have separated,

J- thus deenergizing the auxiliary relay 22 and causing movement of theauxiliary relay contact member 48 to its illustrated or circuitinterrupting position, the secondary relay 23 will become deenergizedand drop to its illustrated or circuit opening position causing themotor l9 to stop when the mechanism completes a tap changing operationcausing the cam switch 66 to open. If, however, the voltage between thesecondary circuit conductors l2 and |3 is still below the desired value,the primary relay contact members 36 and 31 will remain closed, thusmaintaining a circuit through the holding contact 54 and the winding 53of the auxiliary relay closed, and likewise retaining the circuitthrough timing relay contact members 46 and 41 and the auxiliary relaycontact member 48 closed, so as to maintain the winding 56 of thesecondary relay 23 energized and continue the operation of the motor inspite of the opening of the holding circuit of the secondary relay bythe contact 66. As soon as the operation of the motor has continued themovement of the mechanism beyond a tap position the switch 66 is againclosed thus ensuring the completion of another step in the operation ofthe tap changing mechanism.

When the contact members 36 and 31 separate as the desired voltage onthe secondary circuit of the regulated system is reached, the nextsucceeding completion of a tap changing operation by the motor operatedtap-changing mechanism,

resultin g in separation..ofsthedholding circuit bw thecconta'ctmemberntt =1 will: cause. the :.sec; ondaryarelayrZS to: drop .to :its'.circuit '-interrupt-:-'

ing -position, thus. discontinuingnthe regulating operation;

Itwillbe-seen that ii at anytime. .aiterthe initial -"closing-ofithecontact members 36. and

3l 'of the primary relay, and prior to.;the pera-.

tionof-the. secondary relay 23fitota circuit clos ingposit-ionpthe.contacts 36 ;and 31' are again separated the relay 23"willn0t be operatedito a circuit closingposition to cause operationof themotor lfiy If thecontact-members BSand.

3'l"'sepa1-'-ate-after remaining in engagementior a sufficient length oftime -to cause the contact member ifi-to engage the contact member 5 lthus energizing the winding 53 and operating the auxiliary relay to itsupper position, there will be a momentar energization of the winding 56upon =movement of the contact member 46 to: again-engage the contactmember 41 sufiicienty 23"Which is started upon engagement. of thecontact members 35 and 31 includes the heating of the-bimetal 49 to apredetermined temperature to causethe switch contact member 46.130engage the contact member 5!, thusv energizing theauxili'a'ry relay 22to close the preset contact member Manda subsequent cooling of thebimetal-GBto cause the switchmember 66 to again engage the contactznember 41 while the contact member 68 1s closed. Separation of thecontact members 36 and 3'! prior to the completion of the-heatin'gportion of the cycle during which the temperature of the bimet-al- 49 isbeing raised; interrupts the cycle by interrupting the energization ofthe timing relay winding43.

The operation of the mechanism in the reverse direction is caused byoperation of the primary relaym close-the contact members 36 .and

38 -thus effecting a cycle of operation resulting from operation of thetimingrela'y 24:, the aux-'1 iliary relay and the secon ary relay 26that are identicalwith that described for the timing relay 2|, auxiliaryrelay 22 and secondary relay 23,- except that when the secondary relay#26 similar and are similarly munbered except that the partsas'sociatedwith relays 2.4, 25 "and 26 are primed.

Referringto Figs. 2, 3, 4 and 5, the timing relay is -shown mounted on apanel 83 upon which is mounted a support 84 carrying three bimetalelements 49, 85 and 86,: the corresponding ends of-awhich are fixedlyattached to the support 84 by screws 87." The outer or movable'ends ofthe". three 'bimetal elementsare attached by a yoke member-88 landcarryan: operating member. 89-zengaging;a switch plunger shaft 9|.windings? constitutingthe.heating element of the relay. is shown woundabout the middle one 4930i the .three: bimetal elements causing actuaThe from theaplunger. 9 l

The;-;switch..member ofnthe thermalrrelay. isfw-v shown-mounted'onztheopposite side of the panel: 83v. .-from-;the. bimetal, elements 49, .and86 and comprisesapcasing lfll attached 1120 the panel 133 iby anysuitable means, and .:through::- whichtheswitchplungershaft :9! extends.The switch includesananchor member lfllaheldin. .placeuuponctheucasingby a screw I03, the outer end of..which :provides. a terminal for theswitch. 1 connecting.- :to the movable contact member 46.2; The.anchor;- member 102 is generally U-shaped. as. best ShOWH'iIl Fig. 4,andisprovided with.- anaopening Hl4=.through which the. screw l03-spasses. The ends. of the two legs forming the U' are provided withV-shaped notches I05. which pivotally-receive the; en s of a pair 'ofcompres-i sionsprings [162 of the snap-acting switch meme her-i101, bestshown generally in Fig. 5.. A ten=- sion member I08 comprises a part ofthe snap-:-

acting member lill" and-is provided with a hole liiii which'is alsoengaged by. the screw H13. hold-l ing -thesnap mechanism in positionwith the. membersiiiii' bent downwardly and under come pression.asshownin Fig. 3.. The. tension members lil' and thecompression memberI08 to.--

getherconstitute a thin'leaf spring strip joinedto each other at theends carrying .the contact i member 4611 The lower contact member 5! isconnected to a terminal 'screw lll and the upper contact member 41. isconnected to aterminal screw H2 shown in Fig. 2. The upper terminal'd'lnis nmountedonthe lower end of ascrew-threaded member 1 l3 extendingthrough the panel. 83 .for

adjustingthe. position (of the contact member 41 to various positions,as indicatedon a timing.

tiomin whichcontacts 4G and 47 are in engagei. merit, to the position inwhich the contacts 46" an d.5i are in engagement to determine the timingcycle. of the switch.

The springmembers liid and. 168 are adapted.

to move the contact member 45 between the two stationary contact members4'? and 5| with .a

snap action.- The thin leaf compression members H36 are pivotallysupported in the notches H25 of the anchor member I02 and the tension.member I 0815 supported in cantilever fashion under the head of thescrew ms at the base of I the Ueshaped anchor member 102, and passesnear. the pivotal axis of the two compression members I06 at the notchesl 65. lineof the member 198 is deflected across the pivotal axis of thetwo compression members 36, the spring members I06 and 38 will act tosnap the'free end of theileaf spring member I01 carryingrthe contact:member 46 from engagement with one. :of the contact members 4'! or 5|into engagement with the other. The anchor I02 and. the stationarycontact members 41 and 5| which serve as stops for the snap-actingspring member l0l,'are so aligned and positioned that when no pressureis applied to the tension spring,

I 98,:the springs will move the contact member 46 upwardly into normalengagement with the contact member 4'!- as illustrated in Fig. 3.Accordingly,qthe tension member I08 only lies slightly-- .its end.havinga projection v ,I I 6 normally in en- 7 If the tension centergagement with the leaf spring I08 and bearing against the upper surfacethereof as viewed in Fig. 3, at a point intermediate its support underthe head of the screw I03, and a pivoted support of the compressionmembers I06 in the notches I05. When the bimetal element 49 is heated bycurrent flowing through the heating coil 43, causing the actuatingmember 89 and plunger shaft 9| to be moved downwardly, as viewed in Fig.3, a very slight movement of the tension member I08, so as to carry thetension axis below the point of the V-shaped notches I forming the pivotpoint for the leaf springs I06, causes the end of the spring memberscarrying the contact member 46 to snap downwardly into engagement withthe contact member 5|. When this pressure is released, the tensionmember I08 moves about the pivot within the notches I05, causing thecontact member 46 to snap back to its illustrated position in engagementwith the contact member 41.

The positioning of the upper contact member 41 by turning the head ofthe timing dial by the nut I I I, adjusts the timing of the relay byadjusting the predetermined temperature to which the bimetal must beraised in order to operate the switch from its illustrated to its othercircuit closing position. In order to limit the movement of the springmember I0'I carrying the movable contact 46, should the upper contactmember 41 be withdrawn by removing the screw-threaded shaft II3, a stopH8 is provided mounted on a support II9 within the casing IOI of theswitch member.

It will be appreciated that the particular structure shown as a part ofthe thermal relay is not itself the subject matter of this invention,and that the particular thermally responsive element or heating elementtherefor disclosed need not necessarily be employed. A relay is providedhaving a characteristic that when a thermal responsive element is heatedto a predetermined temperature a switch is operated from one of twocircuit closing positions to another, and that when the thermalresponsive element is cooled to another predetermined temperature, theswitch is operated from the second to the first or original of its twocircuit closing positions, and that the cycle of the relay as a timingrelay includes both the heating and the cooling of the thermal elementto operate the switch controlled thereby from its first to its secondclosing position and back again to its first circuit closing position.

Since modifications in the circuits and apparatus illustrated may beemployed within the spirit of my invention, I do not wish to be limitedother- Wise than by the spirit of the appended claims.

I claim as my invention:

1. In a time delay control system for an automatic step-type reversiblemotor driven regulator, in combination, means including a primary relayresponsive to the value of a condition, and relay means controlledthereby for initiating the operation of the control system, said relaymeans including a timing relay, an auxiliary relay and a secondaryrelay, the timing relay having a thermal responsive element and aheating element therefor, a circuit closed through contacts on theprimary relay and contacts on the auxiliary relay for energizing theheating element of the timing relay, said timing relay having contactsoperable upon a predetermined temperature of the heating element forclosing a circuit for operating the auxiliary relay to a presetposition, said auxiliary relay being operative upon movement to itspreset position for interrupting the circuit energizing the heatingelement of the timing relay and for closing a holding circuit forretaining the auxiliary relay in its reset position, contacts on saidauxiliary relay that are closed in the preset position of the relay forclosing one point in a circuit for operating the secondary relay, thetiming relay being operative upon the cooling of the thermal element toa predetermined temperature for completing the circuit for operating thesecondary relay, the auxiliary relay being operative to its initialposition for preventing operation of the secondary relay unless theprimary relay contacts are closed upon completion of the above definedcycle of operation of the several relays for completing the circuit foroperating the secondary relay.

2. In a time delay control system for an automatic step-type reversiblemotor driven regulator, in combination, means including a primary relayresponsive to the value of a condition, an auxiliar relay, a timingrelay and a secondary relay controlled by the primary relay, said timingrelay having a thermal responsive element and a heating elementtherefor, a circuit closed by the contacts of the primary relay forenergizing the heating element of the timing relay, the thermalresponsive element being operative upon a predetermined temperature foreifecting the opera.- tion of the auxiliary relay to a preset positionfor interrupting the energizing circuit for the heating element and forclosing one point in a circuit for effecting the operation of thesecondary relay to a circuit closing position, the thermal responsiveelement being operative upon reduction to a lower predeterminedtemperature for completing the circuit for effecting the operation ofthe secondary relay to a circuit closing position, said circuitincluding the closed contacts of the primar relay, the auxiliary relaybeing operative to its initial position upon completion of the abovedefined cycle for preventing operation of the secondary relay unless theprimary relay contacts are closed upon completion of the abovedefinedcycle of operation of the several relays between the closing of theprimary relay contacts and the secondary relay.

3. In a time delay control system for an automatic step-type reversiblemotor driven regulator, in combination, means including a primary relayresponsive to the value of a condition, and relay means controlledthereby for initiating the operation of the control system, said relaymeans including a timing relay, an auxiliary relay and a secondaryrelay, the timing relay having a thermal responsive element and aheating element therefor, a circuit closed through contacts on theprimary relay and contacts on the auxiliary rela for energizing theheating element of the timing relay, said timing relay having contactsoperable upon a predetermined temperature of the element for closing acircuit for operating the auxiliary relay to a preset position, saidauxiliary relay being operative upon movement to its preset position forinterrupting the circuit energizing the heating element of the timingrelay and for closing a holding circuit for retaining the auxiliar relayin its preset position during the cooling of the thermal responsiveelement, contacts on said auxiliary relay that are closed in the presetposition of the relay for closing one point in a circuit for operatingthe secondary relay to a predetermined position, the timing relay beingoperative upon the cooling of the thermal element to a predetermined 7.9 -"temperature-fon' lcompletingristhe'; circuit if or '"operatingzthea-seoondarynrelay, thexauxiliary relay beingpperative to;its-::initial; position for preventingxoperation. of.theRsecOndaryRrelay to its ;pred'etermin'ed position uunlessitheprimary relay. 1'

:;:contacts are closed: uponicorn-pletion of the above- -sdefined cycle;of. :operationi'of the several relays, -;:circuit: controlling"meanszrzfors sealing: said sec- .Lxon'dar relay: in i its circuit:closing position upon it pperationi oiifsaid :regulator for effectingcon-:1

xtinuediloperation "of the'zmech'anism; throughout T0116 :operating stepindependently of. the separa iti'on fof. the primary relay: :contacts.

4'..JIn a1timedelayxcont1'ol systemiifor an automatic step;type=reversible motor .driven'regulator in" combination; meansrincludinga primary relay -2responsive tothevalue of acondition, an aux 'ary relayhavi-ngl'an iope'rating winding, a tim- -:ing relay :and a 'secondaryrelay controlled by the primary: relay rand: having "two relaypositions,

ing the energizing circuit for. the heating ele-l',

a mentzand for closingone point in a circuit for 'effectingthe-operationof the secondary relay to .n its errergized position,- a holding circuitfor the operating :winding': of the auxiliary rela including'contactsonsaid auxiliary-relay that are closed when the auxiliary relayis in its energized position and contacts on said secondary relay'--wherithe secondary :rela is in its 'deen'ergized -position, the"thermal responsive element being operative upon reduction-to alowerpredeter- "mined temperature for completing the circuit for eifectingthe operation of the secondary' relay to l its energized position, saidcircuit 1 including the closed contacts of the primary r'elayf'theauxiliary relay being operative to its initial position upon completionof the above-defined cycle for preventing operation of the regulatorunless the primar 'relay contacts 'are'closed upon completion of theabove-defined cycle of operation of the several relays between theclosing of the primary relay contacts and the secondary relay.

5. In a time delay control system for an automaticstep-type reversiblemotor driven regulator, 'in-cornbinatiom-meansincluding a primary relayresponsive to the value of acondition'; andrelay means controlledthereby for 'initiating theoper- -'-='ation of the-control-systern;"'s'aid'relay means incl-riding atimingrelay;-anauxiliaryrelay-and a secondary relay, the timing relay having a thermalresponsive element and a heating element therefor, acircuit closedthrough contacts on the primary relay and contacts on the auxiliaryrelay for energizing the heating element of the timing relay, saidtiming relay having contacts operable upon a predetermined temperatureof the heating element for closing a circuit for operating the auxiliaryrelay to a preset position, said auxiliary relay being operative uponmovement to its preset position for interrupting the circuit energizingthe heating element of the timing relay and for closing a holdingcircuit for retaining the auxiliary relay in its reset position, saidholding circuit including contacts on said auxiliary relay that areclosed when the auxiliary relay is in its reset position and contacts onsaid.

10 secondaryrelay when the'isecondary relay is in its anon-operatingpositionya second holding circuit foraetainingrthe auxiliary relay inits res'et :poisitionlincluding contacts on saidv auxiliary relay andcontacts .on .the primary relay, 1 contacts on "said;auxiliaryrelaynthat are closed inthenpreset position of the \relayi-orclosing one pointin a :circuit :foroperating the secondary relay to itsoperating position, the-timing relaybeingoperative upon the" cooling or:the :thermal element to a predetermined temperature for. completing ltheScircuit for ioperating the secondary relay; the

iauxiliary relay beingioperativeto its: initial position uponseparation:tof- 'the primary relay con- .ctacts: fornpreventing: operation of. theregulator i'inlessthe-primary relay contacts are closed upon completionof the above-defined cycle: of 1 operation of theseveral relays; circuitcontrolling means for sealing saidisecondary' relayin1itsicircuit5cl0sing position upon operation of said regulator for:Ieffecting continued operation of the "regulator ithrou'ghout oneioperating. step-independently: of

I the separation of the primary relay contacts.

- 6. "In aitimedelay control systemffor an automatic step typereversible: motor driven regulator, in combinatiom meansi includingapriniary relay responsive to the value'of aconditi'on and a pairof-secondary relays controll'ednthereby, 1 the primary relay havingcontactsthereon for eiiecting-the energization of aseleotedseconda'ry Jrelay, means for. introducing a timedelaybctween the closingoftheprimary relay 'contacts and the 'energiz'ation of J the secondary relaycomprising a'thermal-relay and an auxiliary relay?,the

thermal relay having a temperature responsive element, a heating elementtherefor, and a switch member 1 having two circuitclosing positions; theswitch being OIOSEdlll'l one of its two circuitclosing positions whenthe thermal responsive element of the relay is heated above apredetermined temperature and-closed I in -the other of its two circuitclosing 1 positions when the thermal responsive element of the relay-iscooledbelow a :predetermined temperatura a circuit including 1 theprimary 'relayucontaets and'contacts on the auxiliary relay when initsinitial' position-forenergizing theheating element of the thermalrelay I for effecting operation of the'thermalrelay switch, after a timeinterval,=to its=second circuit clos- '-ing position, the 5 thermalrelayswitch in operating from its first circuit closing position 'to'its second circuit closing position being effective to interrupt thecircuit through the-heating element "of the thermal re1ay-and to close acircuit 'for operating theauxiliary relay to a preset position, i thethermal relayswitch beingeffective, upon cooling andreturn to its-firstcircuit closing-posi- -'-tion'- to close a circuit including contacts onthe auxiliary relay that are closed when the auxiliary relay is in itspreset position for energizing the secondary relay, two holding circuitsfor the auxiliary relay for retaining it in its preset position, oneholding circuit, including contacts on the auxiliary relay that areclosed when the relay is in its preset position, and contacts on theprimary relay, the other holding circuit including contacts on theauxiliary relay that are closed when the relay is in its preset positionand contacts on the secondary relay that are closed when that relay isin its deenergized position.

7. In a time delay control system for an automatic step-type reversiblemotor driven regulator, in combination, a multiple-position switchoperator, an electric motor for operating the switch operator from oneof its positions to an- 11 other, a secondary relay having an operatingwinding and switch contact members for controlling th operation of themotor, a primary relay having contacts thereon for controlling theenergizati-on of the operating winding of the secondary relay, means forintroducing a time delay between the closing of the primary relaycontacts and the energization of the operating winding of the secondaryrelay comprising a thermal relay and an auxiliary relay, the thermalrelay having a temperature responsive element, a heating elementtherefor, and a switch member having two circuit closing positions, theswitch being closed in the first one of its two circuit positions whenthe thermal responsive element of the relay is below a predeterminedtemperature and closed in the second one of its two circuit closingpositions when the thermal responsive element of the relay is heatedabove a predetermined temperature, a circuit including the primary relaycontacts and contacts on the auxiliary relay when in its initialposition for energizing the heating element of the thermal relay foraffecting operation of the thermal relay switch, after a time interval,to its second circuit closing position, the thermal relay switch inoperating from its first circuit closing position to its second circuitclosing position being effective to interrupt the circuit through theheating element of the thermal relay and to close a circuit foroperating the auxiliary relay to a preset position, the thermal relayswitch being efiective, upon cooling and return to its first circuitclosing position to close a circuit including contacts on the auxiliaryrelay that are closed when the auxiliary relay is in its preset positionfor energizing the secondary relay, a control switch and means foroperating the control switch to a circuit closing position uponoperation of the motor to effect movement of the multiple positionswitch operator from one of its multiple positions to another and foroperating the control switch to a circuit opening position uponcompletion of movement to another one of its positions, and a holdingcircuit for maintaining the secondary relay operating winding energizedincluding the above defined motor operated control switch and contactson the secondary relay that are closed when it is in its energizedposition.

8. In a time delay control system for an automatic step-type reversiblemotor driven regulator, in combination, an electric motor for oper atingthe regulator, a secondary relay having an operating winding and switchcontact members for controlling the operation of the motor, a circuitcontroller responsive to the value of a condition for initiating theoperation of said control system, a thermal time delay means operativeupon the operation of said circuit controller to a circuit closingposition for introducing a time delay between the operation of thecircuit controller and the operation of the regulator, said thermal timedelay means having two circuit closing positions and being operative toone of said two positions in response to the heating of the thermalmeans to a predetermined high temperature, and operative to the other ofsaid two positions in response to the cooling of the thermal means to apredetermined lower temperature, an auxiliary relay controlled by saidthermal time delay means, having two operative positions and beingoperable to a circuit closing position upon operation of said thermaltime delay relay in response to a high predetermined temperature, aholding circuit completed through two sets of contacts one of which iscontrolled by the auxiliary relay and the other of which is controlledby said circuit controller for holding said auxiliary relay in itscircuit closing position, a second holding circuit for said auxiliaryrelay including contacts on the auxiliary relay that are closed when theauxiliary relay is in its circuit closing position and contacts that areclosed when said secondary relay is in its deenergized position, andpreset contacts on said auxiliary relay that are closed when theauxiliary relay is in its circuit closing position for closing one pointin a circuit for energizing the winding of the secondary relay whichcircuit is completed when the thermal time delay means is operated toits second circuit closing position upon the cooling of the thermalmeans to the lower predetermined temperature, the secondary relay beingenergized and operated to a motor starting position upon the completionof the cycle of operation of the time delay means and continued closureof the circuit controller, the cycle of operation of the time delaymeans including the interval during which the thermal responsive elementis first heated to the predetermined higher temperature and the intervalduring which the thermal responsive element is then cooled to thepredetermined lower temperature.

PAUL NARBUTOVSKIH.

REFERENCES CITED The following references arc of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 1,746,827 Fry et al. Feb. 11,1930 1,983,506 Willing Dec. 4, 1934 2,079,492 Courtin May 4, 19372,220,769 Lennox Nov. 5, 1940 2,295,355 Prescott Sept. 8, 1942

